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Diffstat (limited to 'net')
-rw-r--r--net/can/Kconfig1
-rw-r--r--net/can/af_can.c23
-rw-r--r--net/can/bcm.c26
-rw-r--r--net/can/gw.c42
-rw-r--r--net/can/isotp.c46
-rw-r--r--net/can/j1939/socket.c16
-rw-r--r--net/can/j1939/transport.c39
-rw-r--r--net/can/raw.c23
-rw-r--r--net/core/skbuff.c4
9 files changed, 152 insertions, 68 deletions
diff --git a/net/can/Kconfig b/net/can/Kconfig
index af64a6f76458..abbb4be7ad21 100644
--- a/net/can/Kconfig
+++ b/net/can/Kconfig
@@ -5,6 +5,7 @@
menuconfig CAN
tristate "CAN bus subsystem support"
+ select SKB_EXTENSIONS
help
Controller Area Network (CAN) is a slow (up to 1Mbit/s) serial
communications protocol. Development of the CAN bus started in
diff --git a/net/can/af_can.c b/net/can/af_can.c
index 770173d8db42..22c65a014861 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -641,6 +641,16 @@ static int can_rcv_filter(struct can_dev_rcv_lists *dev_rcv_lists, struct sk_buf
return matches;
}
+void can_set_skb_uid(struct sk_buff *skb)
+{
+ /* create non-zero unique skb identifier together with *skb */
+ while (!(skb->hash))
+ skb->hash = atomic_inc_return(&skbcounter);
+
+ skb->sw_hash = 1;
+}
+EXPORT_SYMBOL(can_set_skb_uid);
+
static void can_receive(struct sk_buff *skb, struct net_device *dev)
{
struct can_dev_rcv_lists *dev_rcv_lists;
@@ -652,9 +662,7 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
atomic_long_inc(&pkg_stats->rx_frames);
atomic_long_inc(&pkg_stats->rx_frames_delta);
- /* create non-zero unique skb identifier together with *skb */
- while (!(can_skb_prv(skb)->skbcnt))
- can_skb_prv(skb)->skbcnt = atomic_inc_return(&skbcounter);
+ can_set_skb_uid(skb);
rcu_read_lock();
@@ -679,7 +687,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev)
static int can_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
- if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_can_skb(skb))) {
+ if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) ||
+ !can_skb_ext_find(skb) || !can_is_can_skb(skb))) {
pr_warn_once("PF_CAN: dropped non conform CAN skbuff: dev type %d, len %d\n",
dev->type, skb->len);
@@ -694,7 +703,8 @@ static int can_rcv(struct sk_buff *skb, struct net_device *dev,
static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
- if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_canfd_skb(skb))) {
+ if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) ||
+ !can_skb_ext_find(skb) || !can_is_canfd_skb(skb))) {
pr_warn_once("PF_CAN: dropped non conform CAN FD skbuff: dev type %d, len %d\n",
dev->type, skb->len);
@@ -709,7 +719,8 @@ static int canfd_rcv(struct sk_buff *skb, struct net_device *dev,
static int canxl_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
- if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) || !can_is_canxl_skb(skb))) {
+ if (unlikely(dev->type != ARPHRD_CAN || !can_get_ml_priv(dev) ||
+ !can_skb_ext_find(skb) || !can_is_canxl_skb(skb))) {
pr_warn_once("PF_CAN: dropped non conform CAN XL skbuff: dev type %d, len %d\n",
dev->type, skb->len);
diff --git a/net/can/bcm.c b/net/can/bcm.c
index 7eba8ae01a5b..b7324e9c955b 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -59,6 +59,7 @@
#include <linux/can/bcm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <net/can.h>
#include <net/sock.h>
#include <net/net_namespace.h>
@@ -291,6 +292,7 @@ static int bcm_proc_show(struct seq_file *m, void *v)
static void bcm_can_tx(struct bcm_op *op)
{
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct net_device *dev;
struct canfd_frame *cf;
int err;
@@ -310,13 +312,17 @@ static void bcm_can_tx(struct bcm_op *op)
return;
}
- skb = alloc_skb(op->cfsiz + sizeof(struct can_skb_priv), gfp_any());
+ skb = alloc_skb(op->cfsiz, gfp_any());
if (!skb)
goto out;
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ goto out;
+ }
+
+ csx->can_iif = dev->ifindex;
skb_put_data(skb, cf, op->cfsiz);
@@ -1318,6 +1324,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
int cfsiz)
{
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct net_device *dev;
int err;
@@ -1325,11 +1332,15 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
if (!ifindex)
return -ENODEV;
- skb = alloc_skb(cfsiz + sizeof(struct can_skb_priv), GFP_KERNEL);
+ skb = alloc_skb(cfsiz, GFP_KERNEL);
if (!skb)
return -ENOMEM;
- can_skb_reserve(skb);
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
err = memcpy_from_msg(skb_put(skb, cfsiz), msg, cfsiz);
if (err < 0) {
@@ -1343,8 +1354,7 @@ static int bcm_tx_send(struct msghdr *msg, int ifindex, struct sock *sk,
return -ENODEV;
}
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx->can_iif = dev->ifindex;
skb->dev = dev;
can_skb_set_owner(skb, sk);
err = can_send(skb, 1); /* send with loopback */
diff --git a/net/can/gw.c b/net/can/gw.c
index 55eccb1c7620..61a1e6b1b83f 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -55,6 +55,7 @@
#include <linux/can/core.h>
#include <linux/can/skb.h>
#include <linux/can/gw.h>
+#include <net/can.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
@@ -70,8 +71,8 @@ MODULE_ALIAS(CAN_GW_NAME);
#define CGW_MAX_HOPS 6
#define CGW_DEFAULT_HOPS 1
-static unsigned int max_hops __read_mostly = CGW_DEFAULT_HOPS;
-module_param(max_hops, uint, 0444);
+static unsigned char max_hops __read_mostly = CGW_DEFAULT_HOPS;
+module_param(max_hops, byte, 0444);
MODULE_PARM_DESC(max_hops,
"maximum " CAN_GW_NAME " routing hops for CAN frames "
"(valid values: " __stringify(CGW_MIN_HOPS) "-"
@@ -459,6 +460,7 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
struct cgw_job *gwj = (struct cgw_job *)data;
struct canfd_frame *cf;
struct sk_buff *nskb;
+ struct can_skb_ext *csx, *ncsx;
struct cf_mod *mod;
int modidx = 0;
@@ -471,22 +473,15 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
return;
}
+ csx = can_skb_ext_find(skb);
+ if (!csx)
+ return;
+
/* Do not handle CAN frames routed more than 'max_hops' times.
* In general we should never catch this delimiter which is intended
* to cover a misconfiguration protection (e.g. circular CAN routes).
- *
- * The Controller Area Network controllers only accept CAN frames with
- * correct CRCs - which are not visible in the controller registers.
- * According to skbuff.h documentation the csum_start element for IP
- * checksums is undefined/unused when ip_summed == CHECKSUM_UNNECESSARY.
- * Only CAN skbs can be processed here which already have this property.
*/
-
-#define cgw_hops(skb) ((skb)->csum_start)
-
- BUG_ON(skb->ip_summed != CHECKSUM_UNNECESSARY);
-
- if (cgw_hops(skb) >= max_hops) {
+ if (csx->can_gw_hops >= max_hops) {
/* indicate deleted frames due to misconfiguration */
gwj->deleted_frames++;
return;
@@ -499,7 +494,7 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
/* is sending the skb back to the incoming interface not allowed? */
if (!(gwj->flags & CGW_FLAGS_CAN_IIF_TX_OK) &&
- can_skb_prv(skb)->ifindex == gwj->dst.dev->ifindex)
+ csx->can_iif == gwj->dst.dev->ifindex)
return;
/* clone the given skb, which has not been done in can_rcv()
@@ -518,12 +513,23 @@ static void can_can_gw_rcv(struct sk_buff *skb, void *data)
return;
}
+ /* the cloned/copied nskb points to the skb extension of the original
+ * skb with an increased refcount. skb_ext_add() creates a copy to
+ * separate the skb extension data to modify the can_gw_hops.
+ */
+ ncsx = skb_ext_add(nskb, SKB_EXT_CAN);
+ if (!ncsx) {
+ kfree_skb(nskb);
+ gwj->dropped_frames++;
+ return;
+ }
+
/* put the incremented hop counter in the cloned skb */
- cgw_hops(nskb) = cgw_hops(skb) + 1;
+ ncsx->can_gw_hops = csx->can_gw_hops + 1;
/* first processing of this CAN frame -> adjust to private hop limit */
- if (gwj->limit_hops && cgw_hops(nskb) == 1)
- cgw_hops(nskb) = max_hops - gwj->limit_hops + 1;
+ if (gwj->limit_hops && ncsx->can_gw_hops == 1)
+ ncsx->can_gw_hops = max_hops - gwj->limit_hops + 1;
nskb->dev = gwj->dst.dev;
diff --git a/net/can/isotp.c b/net/can/isotp.c
index ce588b85665a..da3b72e7afcc 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -69,6 +69,7 @@
#include <linux/can/skb.h>
#include <linux/can/isotp.h>
#include <linux/slab.h>
+#include <net/can.h>
#include <net/sock.h>
#include <net/net_namespace.h>
@@ -214,24 +215,28 @@ static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus)
{
struct net_device *dev;
struct sk_buff *nskb;
+ struct can_skb_ext *csx;
struct canfd_frame *ncf;
struct isotp_sock *so = isotp_sk(sk);
int can_send_ret;
- nskb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), gfp_any());
+ nskb = alloc_skb(so->ll.mtu, gfp_any());
if (!nskb)
return 1;
+ csx = can_skb_ext_add(nskb);
+ if (!csx) {
+ kfree_skb(nskb);
+ return 1;
+ }
+
dev = dev_get_by_index(sock_net(sk), so->ifindex);
if (!dev) {
kfree_skb(nskb);
return 1;
}
- can_skb_reserve(nskb);
- can_skb_prv(nskb)->ifindex = dev->ifindex;
- can_skb_prv(nskb)->skbcnt = 0;
-
+ csx->can_iif = dev->ifindex;
nskb->dev = dev;
can_skb_set_owner(nskb, sk);
ncf = (struct canfd_frame *)nskb->data;
@@ -763,6 +768,7 @@ static void isotp_send_cframe(struct isotp_sock *so)
{
struct sock *sk = &so->sk;
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct net_device *dev;
struct canfd_frame *cf;
int can_send_ret;
@@ -772,15 +778,20 @@ static void isotp_send_cframe(struct isotp_sock *so)
if (!dev)
return;
- skb = alloc_skb(so->ll.mtu + sizeof(struct can_skb_priv), GFP_ATOMIC);
+ skb = alloc_skb(so->ll.mtu, GFP_ATOMIC);
if (!skb) {
dev_put(dev);
return;
}
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ netdev_put(dev, NULL);
+ return;
+ }
+
+ csx->can_iif = dev->ifindex;
cf = (struct canfd_frame *)skb->data;
skb_put_zero(skb, so->ll.mtu);
@@ -940,6 +951,7 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
struct sock *sk = sock->sk;
struct isotp_sock *so = isotp_sk(sk);
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct net_device *dev;
struct canfd_frame *cf;
int ae = (so->opt.flags & CAN_ISOTP_EXTEND_ADDR) ? 1 : 0;
@@ -1000,16 +1012,22 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
goto err_out_drop;
}
- skb = sock_alloc_send_skb(sk, so->ll.mtu + sizeof(struct can_skb_priv),
- msg->msg_flags & MSG_DONTWAIT, &err);
+ skb = sock_alloc_send_skb(sk, so->ll.mtu, msg->msg_flags & MSG_DONTWAIT,
+ &err);
if (!skb) {
dev_put(dev);
goto err_out_drop;
}
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ netdev_put(dev, NULL);
+ err = -ENOMEM;
+ goto err_out_drop;
+ }
+
+ csx->can_iif = dev->ifindex;
so->tx.len = size;
so->tx.idx = 0;
diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c
index ff9c4fd7b433..0502b030d238 100644
--- a/net/can/j1939/socket.c
+++ b/net/can/j1939/socket.c
@@ -17,6 +17,7 @@
#include <linux/can/skb.h>
#include <linux/errqueue.h>
#include <linux/if_arp.h>
+#include <net/can.h>
#include "j1939-priv.h"
@@ -884,20 +885,25 @@ static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev,
struct j1939_sock *jsk = j1939_sk(sk);
struct j1939_sk_buff_cb *skcb;
struct sk_buff *skb;
+ struct can_skb_ext *csx;
int ret;
skb = sock_alloc_send_skb(sk,
size +
sizeof(struct can_frame) -
- sizeof(((struct can_frame *)NULL)->data) +
- sizeof(struct can_skb_priv),
+ sizeof(((struct can_frame *)NULL)->data),
msg->msg_flags & MSG_DONTWAIT, &ret);
if (!skb)
goto failure;
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = ndev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ ret = -ENOMEM;
+ goto failure;
+ }
+
+ csx->can_iif = ndev->ifindex;
skb_reserve(skb, offsetof(struct can_frame, data));
ret = memcpy_from_msg(skb_put(skb, size), msg, size);
diff --git a/net/can/j1939/transport.c b/net/can/j1939/transport.c
index 8656ab388c83..2cbe94fc487a 100644
--- a/net/can/j1939/transport.c
+++ b/net/can/j1939/transport.c
@@ -9,6 +9,7 @@
// Oleksij Rempel <kernel@pengutronix.de>
#include <linux/can/skb.h>
+#include <net/can.h>
#include "j1939-priv.h"
@@ -591,17 +592,21 @@ sk_buff *j1939_tp_tx_dat_new(struct j1939_priv *priv,
bool swap_src_dst)
{
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct j1939_sk_buff_cb *skcb;
- skb = alloc_skb(sizeof(struct can_frame) + sizeof(struct can_skb_priv),
- GFP_ATOMIC);
+ skb = alloc_skb(sizeof(struct can_frame), GFP_ATOMIC);
if (unlikely(!skb))
return ERR_PTR(-ENOMEM);
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ return ERR_PTR(-ENOMEM);
+ }
+
skb->dev = priv->ndev;
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx->can_iif = priv->ndev->ifindex;
/* reserve CAN header */
skb_reserve(skb, offsetof(struct can_frame, data));
@@ -1052,6 +1057,17 @@ static int j1939_simple_txnext(struct j1939_session *session)
goto out_free;
}
+ /* the cloned skb points to the skb extension of the original se_skb
+ * with an increased refcount. skb_ext_add() creates a copy to
+ * separate the skb extension data which is needed to modify the
+ * can_framelen in can_put_echo_skb().
+ */
+ if (!skb_ext_add(skb, SKB_EXT_CAN)) {
+ kfree_skb(skb);
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
can_skb_set_owner(skb, se_skb->sk);
j1939_tp_set_rxtimeout(session, J1939_SIMPLE_ECHO_TIMEOUT_MS);
@@ -1526,17 +1542,22 @@ j1939_session *j1939_session_fresh_new(struct j1939_priv *priv,
const struct j1939_sk_buff_cb *rel_skcb)
{
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct j1939_sk_buff_cb *skcb;
struct j1939_session *session;
- skb = alloc_skb(size + sizeof(struct can_skb_priv), GFP_ATOMIC);
+ skb = alloc_skb(size, GFP_ATOMIC);
if (unlikely(!skb))
return NULL;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ return NULL;
+ }
+
skb->dev = priv->ndev;
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = priv->ndev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx->can_iif = priv->ndev->ifindex;
skcb = j1939_skb_to_cb(skb);
memcpy(skcb, rel_skcb, sizeof(*skcb));
diff --git a/net/can/raw.c b/net/can/raw.c
index 12293363413c..eee244ffc31e 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -53,6 +53,7 @@
#include <linux/can/core.h>
#include <linux/can/skb.h>
#include <linux/can/raw.h>
+#include <net/can.h>
#include <net/sock.h>
#include <net/net_namespace.h>
@@ -76,7 +77,7 @@ MODULE_ALIAS("can-proto-1");
struct uniqframe {
const struct sk_buff *skb;
- int skbcnt;
+ u32 hash;
unsigned int join_rx_count;
};
@@ -164,7 +165,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
/* eliminate multiple filter matches for the same skb */
if (this_cpu_ptr(ro->uniq)->skb == oskb &&
- this_cpu_ptr(ro->uniq)->skbcnt == can_skb_prv(oskb)->skbcnt) {
+ this_cpu_ptr(ro->uniq)->hash == oskb->hash) {
if (!ro->join_filters)
return;
@@ -174,7 +175,7 @@ static void raw_rcv(struct sk_buff *oskb, void *data)
return;
} else {
this_cpu_ptr(ro->uniq)->skb = oskb;
- this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;
+ this_cpu_ptr(ro->uniq)->hash = oskb->hash;
this_cpu_ptr(ro->uniq)->join_rx_count = 1;
/* drop first frame to check all enabled filters? */
if (ro->join_filters && ro->count > 1)
@@ -918,6 +919,7 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
struct raw_sock *ro = raw_sk(sk);
struct sockcm_cookie sockc;
struct sk_buff *skb;
+ struct can_skb_ext *csx;
struct net_device *dev;
unsigned int txmtu;
int ifindex;
@@ -951,14 +953,19 @@ static int raw_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
goto put_dev;
}
- skb = sock_alloc_send_skb(sk, size + sizeof(struct can_skb_priv),
- msg->msg_flags & MSG_DONTWAIT, &err);
+ skb = sock_alloc_send_skb(sk, size, msg->msg_flags & MSG_DONTWAIT,
+ &err);
if (!skb)
goto put_dev;
- can_skb_reserve(skb);
- can_skb_prv(skb)->ifindex = dev->ifindex;
- can_skb_prv(skb)->skbcnt = 0;
+ csx = can_skb_ext_add(skb);
+ if (!csx) {
+ kfree_skb(skb);
+ err = -ENOMEM;
+ goto put_dev;
+ }
+
+ csx->can_iif = dev->ifindex;
/* fill the skb before testing for valid CAN frames */
err = memcpy_from_msg(skb_put(skb, size), msg, size);
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 4d3920e5b141..648c20e19038 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -78,6 +78,7 @@
#include <net/mpls.h>
#include <net/mptcp.h>
#include <net/mctp.h>
+#include <net/can.h>
#include <net/page_pool/helpers.h>
#include <net/psp/types.h>
#include <net/dropreason.h>
@@ -5139,6 +5140,9 @@ static const u8 skb_ext_type_len[] = {
#if IS_ENABLED(CONFIG_INET_PSP)
[SKB_EXT_PSP] = SKB_EXT_CHUNKSIZEOF(struct psp_skb_ext),
#endif
+#if IS_ENABLED(CONFIG_CAN)
+ [SKB_EXT_CAN] = SKB_EXT_CHUNKSIZEOF(struct can_skb_ext),
+#endif
};
static __always_inline unsigned int skb_ext_total_length(void)
generated by cgit v1.2.3 (git 2.46.0) at 2026-02-24 12:50:20 +0000